Sargassum-based biosorption for glyphosate removal: A green, efficient, and sustainable approach

This study investigated the biosorbent capacity of different Sargassum spp. morphotypes from the Mexican Caribbean for glyphosate removal, identifying Sargassum fluitans III as the most effective by its adsorption capacity. Physicochemical characterization confirmed the presence of glyphosate and morphological changes in sargassum after biosorption. Then, various experimental parameters were evaluated, including the initial concentration of glyphosate, particle size, and temperature, to facilitate a mechanistic analysis. Using different kinetic, isothermal, and thermodynamic models, a combination of adsorption phenomena was revealed in the removal process; furthermore, increased temperature also improves the removal of glyphosate by sargassum. This research demonstrates the viability of utilizing Sargassum ssp., a biomass treated as waste, as a sustainable, environmentally friendly, and efficient resource for wastewater treatment, laying the groundwork for its application in chemical technology engineering for industrial processes. • Diverse Sargassum spp. were evaluated for glyphosate removal in water. • The adsorption process can be described by the PFO, PSO, and the Freundlich models. • Particle size alters the diffusion coefficient, enhancing adsorption kinetics. • The thermodynamic model showed a spontaneous and endothermic adsorption process. • Glyphosate adsorption is effective in non-ideal water sample conditions.